Using Gaia and XMM-Newton to constrain the distance to and properties of the central compact object of a supernova remnant, an extremely light (\(0.7{7}_{-0.17}^{+0.20}\) solar masses) neutron star has been found. This mass is twice as light as normally found for these kinds of object, and places limits on the allowed equations of state of neutron star matter.
- Victor Doroshenko
- Valery Suleimanov
- Andrea Santangelo
